Its county seat is San Antonio, the second-most populous city in Texas and the seventh-largest city in the United States. Bexar County is included in the San Antonio-New Braunfels, TX metropolitan statistical area. Bexar county includes Government Canyon state natural area in northwestern part of the county.
If the screen width is 7 feet and the projector's throw ratio is 2.0 - 2.4:1 (because projectors have zoom lenses, they also have a range of throw ratios) then you can place your projector anywhere from 14 to 16.8 feet away from the screen.
One reason is that the screen size for a projector can get quite large. Viewing a 100 screen from five feet away can be a literal pain in the neck. Additionally, the larger the screen, the greater the volume of your living room you won't be able to walk through without blocking part of the screen.